Talking machine or like apparatus



' July 21, 1925.

N. PEMBERTONBILLING TALKING MACHINE OR LIKE APPARATUS Filed Aug. 5, 1922Patented July 21, 1925.

1 UNITED STATES PA TENT OFFICE;

NOEL PEMBERTON-BILLING, 03E LONDON, ENG-LAND, ASSIGNOR OE ONE-HALF TOWORLD RECORD LIMITED, OF LONDON, ENGLAND, A BRITISH COMPANY.

TALKING MACHINE on LIKE APPARATUS.

Application filed August 15,1922. Serial No. 582,219. 4

ToaZZ whom it may concern: 7

Be it known that I, NOEL PEMBERTON- BILLING, subject of the King ofEngland, residing in London, England, have invented certain new anduseful-Improvements in Talking Machines or like Apparatus, of which thefollowing is aspecification.

This invention consists in improvements in or relating totalking-machines of the disc-record type in which uniform speed of thespiral grooveof the record in relation to the stylus-point of therecording or reproducing gramophone is desired.

Many suggestions have, in thepast been made for devices for obtainingthe desired speed-relationship between the record-groove and the'stylus-point but such earlier attempts do not appear to havemet withcommercial success. An object ofthe present invention is to provideimproved means for this purpose constructed as an attachment for agramophone.

According to the chief feature of the-present invention means forobtaining uniform speed of the spiral groove of a-disc-record inrelation to the sty1us-point, which means comprise an unitary attachmenthaving a friction-wheel adapted to track with its periphery on orapproximately on the spiral of the record-surface and a constant-speedgovernor geared to said friction-wheel, is characterized by means whichare not only driven by an operative connection with the record but inaddition are so constructed as to traverse said friction-wheel acrossthe record-surface along a straight line fixed in space and radiatingfrom the center of the record.

The foregoing and other features of the invention will be more clearlyunderstood from the following description, given by way of example, of apreferred embodiment 'of the invention illustrated in the accompanyingdrawings, in Which- Figure 1 is a central sectional elevation of aspeed-controlling device according to the invention, the section beingtaken in a plane containing the axis of the sound-box with which thespeed-controlling device is associated; and

Figure 2 is a section on the line II-II of Flgure 1.

Like reference numerals indicate like parts in both figures of thedrawings.

Thedrawings show mainly diagrammatically one form of the invention inwhich the speed-controlling mechanism is incorporated with or is formedas an attachment for the sound-box 40. In this example the stylus-point52 is to be understood as be ing traversed-across a diameter of therecord by means of a telescopic tone-arm 38, 39. The sound-box issecured to the "outer end of the inner member 39 and the end of theouter member 38 is mounted in a support37 from which any suitableconnection is made to a horn or other sound-projecting device. Theturntable is diagrammatically shown at and a disc-record is shownthereon at 36. i

The speed-control device comprises a frlction-disc 41 mounted inhearings in a dished disc 42 which is secured by a bracket 43, 44 to thetone-arm 39 in close proximity to the sound-box 40. The friction-disc 41engages with a smaller friction-wheel 45 on the spindle of which ismounted a rotatable brake-carrier 46 located within the rim of themember 42. The brake-carrier is furnished with brake-shoes 47 pressedoutwardly by springs 48 the tension of which is controlled by resilientarms 49 pivoted at 50. -A slider 51 serves to regulate the outwardpressure of the arms 49 and thus to regulate also the tension of thesprings 48.

The stylus-point is diagrammatically illustrated at 52 and it will beseen that the latter and the friction-disc 41 both engage therecord-surface simultaneously at positions which are close together.Thus, the disc 41 will be rotated by frictional engagement with therecord-surface. The speed of rotation of the disc 41 is governed by thepressure of the brake-shoes 47 on the rim 42 and any tendency toincrease in speed will be checked by increased pressure of thebrake-shoes 47 on the rim 42 brought about by centrifugal force. Stemsfrom the brakeshoes are guided in channels, as clearly illustrated inFigure 2.

It will be therefore seen that as the fricv tion-disc 41 traverses therecord-surface by means of its attachment to the telescopic tone-arm 38,39, it will track on, or approximately on, the spiral record-groove andwill travel along a straight line fixed in space and radiating from thecenter of rotation of the record-surface; and that part of the recordwhich passes in contact with the disc willbe controlled (by reason ofthe governor control of the disc) to move at an uniform linear speed atall times. As the stylus-point is close to the point of engagementbetween the wheel 41 and the recordsurface it follows that thespeed-relation between the stylus-point and the record-groove will alsobe maintained substantially uniform at all times.

vObviously arecording machine for making records can, according to thisinvention, be similarly provided with the speed con't-rol mechanismsdescribed and illustrated above.

lVhat I claim as my invention and desire to secure ,by Letters Patentis 1. F or a gramophone having a disc record, means for obtaininguniform speed of the spirall track of the record in relation -to thestylus point, said means comprising a unitary attachment having in it afriction wheel adapted to track with its periphery substantially (on thespiral of the record surface, and a constant speed governor geared ,tosaid friction wheel, and, in combination with said attachment,2111011115 to move the friction -wheel across the record in a straightradial line.

2. For a gramophone having a disc reco1'd,=;1neansfo1' obtaining uniformspeed of the spiral traclr ofthe record in relation to the stylus:point, said means comprising a unitary attachment having in combinationa friction wheel adapted to track with its periphery substantially onthe spiral of the record :surface and 'to be driven by v,thatsun face,and a constant speed governor secured thereto, and, in combination withsaid attachment, means operated from the rec- 0rd to move the frictionwheel across the record in a straight radial line.

3. For a gramophone having a soundbox movable along a straight radialline across a disc record, means for obtaining uniform speedof thespiral of the record in relation to the sound-box stylus, said meanscomprising a unitary attachment having in combination a driven frictionwheel adapt- .ed to track with its periphery substantially on the spiralof the record, a constant speed governor geared to said friction wheeland means operative to connect said attachment to vthe sound-box so thatthe friction wheel of the attachment is traversed along said radial linewith the plane of the friction wheel substantially perpendicular to thatline.

a. For a gramophone having a SOUllClr'bOX movable along a straightradial line across a disc record, means for obtaining uniform speed of'thespiral of the record in relation to the sound-box stylus, said means,comprising a unitary attachment having in combination a driven frictionwheel adapted to track with its periphery substantially on the spiralofthe record, ,a constant speed governor geared to said friction wheeland means for mounting said attachment ona tone-arm to which the soundbox is ,attached so that the plane .of the friction avheel is parallelwith that of the sounddaox diaphragm and the ,pointof contact betweenthe friction :wheeliand the record surface vand that between the styluspoint and the record surface are situated close together on theaforesaid straight radial line.

In testimony whereof I aflin my signa- NOEL P MBERr N- ILLING.

true.

